You need the hplip driver. See HP LaserJet 1020 Printer
The driver is available in portage. With the driver installed CUPS should see your printer.
There will be some setup help on the same site as the link above.

HP aren't all bad - they do support open source._________________Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.